Expectations of battery cells are high: they are to become more efficient, safe, cost-effective and sustainable. Hereby, the materials used play a key role. In the competence cluster ExcellBattMat, new material concepts for future high-energy battery systems are therefore being developed, characterised and tested. With cluster partners in Dresden, Munich, Münster and Ulm, Germany's strongest battery material scientists have joined forces to cooperate under the umbrella concept “Research Fab Battery Cells” of the German Federal Ministry of Education and Research (BMBF). The Federal Ministry of Education and Research is funding the competence cluster with around 16 million euros.